Yes they're mostly fake cases but there shouldn't be any difference regarding the signal with the real or fake cases. If the real cases doesn't degrade the signal then the copied ones shouldn't have a problem either. What made you think the fake ones would perform worse?
Yeah scientific analysis galor.....POWWW
Long story short you put anything around the iphone that connects the antennas that conducts electricity it creates an artificial death grip causing signal degridation. The pieces of polymer on this case and even cases that Element and Draco made for the 4/4s breaks that circuit causing hypothetically no signal loss.
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